Commodities which are identical and interchangeable are also known as "Fungible Goods". These are materials being of the same kind and commercial quality, possessing the same technical and physical characteristics, and which after being incorporated into the finished product cannot be distinguished from one another for origin purposes by virtue of any markings, etc. Determined by: PHYSICAL SEGREGATION of each of the materials; or ACCOUNTING SEGREGATION of stock control applicable, or inventory management practice, in the exporting Party. Once a decision has been taken on the inventory management method, that method shall be used throughout the fiscal year.